• Add 1 pin to turn on/off 20W 1-2ohm cement resistor to save voltage of peltier(1 ohm) to cool room temperature -15 degree Celsius (Currently -5 degree is maximum)
• Add power switch
• Add 1 pin for LED to show status, especially when it’s done. Not important if IFTTT is supported.
• Add 1 pin to turn on/off 20W 1-2ohm cement resistor to save voltage of peltier(1 ohm) to cool room temperature -15 degree Celsius (Currently -5 degree is maximum)
• Add power switch
• Add 1 pin for LED to show status, especially when it’s done. Not important if IFTTT is supported.